Arrangement for rapidly mounting driving or driven parts on their shafts



July 18, 1950 2,515,303

G. ISNARD ARRANGEMENT FOR RAPIDLY MOUNTING DRIVING FTS OR DRIVEN PA ONTHEIR SHA Filed y 25, 1945 Patented July 18, 1950 ARRANGEMENT FORRAPIDLY MOUNTING DRIVING. OR DRIVEN PARTS ON THEIR SHAFTS GeorgesIsnard, Toulon, France, assignor to S- ciete ditez Societe Anonyme desEtablissements Isnard Freres, 'Toulon, France Application July 25, 1945,Serial No. 606,897

- In France June 5, 1942 A difficult and time consuming problem stillexists in rapidly and fixedly securing such driving parts as forinstance, pulleys or such driven members as for instance, fiywheels,screws, transmission parts, on their shafts, since it involves more orless intricate mechanical expedients which are usually keyed, driven orthreaded couplings, etc.

Besides, such expedients most frequently turn out defectively ordangerously: thus, keys become sheared, or the parts can be uncoupledonly by the rough use of a, hammer or a crowbar, this bringing about thedanger of breaking said parts or bending the shafts on which same aremounted.

The arrangement providing the subject-matter of this invention isextremely simple and perfectly efficient; it does away with every keyingor fitting and allows both the mounting of the part and the removalthereof rapidly and easily.

Several embodiments will be described hereinafter merely by way ofexample, reference being had to the drawing appended hereto.

Figure 1 is an axial cross-sectional view of the arrangement as appliedto the fastening of a driving pulley on its shaft.

Figure 2 is a similar view showing a modification.

Figures 3 and 4 show in a similar way the mounting of a shaft onball-bearings.

In the example shown in Fig. 1 a pulley B the position of which isdetermined by a shoulder or a collar has a sliding fit on the shaft A,and its bore fits the latter along a portion B say for about one-half ofits breadth, while ithas a conical bore on the other portion at B A pairof bushing halves C and C fit the shaft A at their insides while attheir outsides they are machined conically to match the conical bore inportion B Milled in said bushing halves, which together form a completesleeve is a circular groove D in which a similarly shaped collar N isreceived which is extended in spaced relation from the base portion of atightening nut E to be screwed on the threaded end G of the shaft.

It is only necessary to slip pulley B on shaft A and to push it homeagainst the shoulder or the collar provided for that purpose, then toscrew the nut E on the shaft following the fitting of the collar on thesame into the grooves in the bushing halves C and C while keeping thewhole assembled during the mounting. As the nut E is tightened the shellformed by the bushing 3 Claims. (01. 2 7-53) halves is forced into theconical housinglprovided therefor in portion B of the pulley-,wherebythe said shell wedges itself between shaft1A with its corresponding boreand the conical wall in the portion B with its outer conicalzsurface,both parts thus being made absolutely-'fast-with each other. H11.)

For removing the pulley it is only. necessary to loosen the nut E thebase collar vN'of which, being engaged within the grove Din the shellformed by the bushing halves C, C pulls said shell out of the conicalbore 13 in the pulley, whereby the latter can be removed from theshaft Awithout any trouble. r I

Preferably, the inner end of the conical bore B terminates in a circulargroove F suitably proportioned to the dimensions of the part, as shown.

Figure 2, in which primed letters of reference denote the same parts,shows a modified embodiment; the only difference resides in the externalarrangement of the groove D and the corresponding collar N instead ofthe internal arrangement according to Fig. 1.

It is to be understood that both these embodiments are given merely byway of example without limiting the scope of this invention and that allunessential modifications of construction can be made thereto. Thus, theshell can be formed of more than two elements without altering thewedging action.

It is to be understood also that said arrangement allows the fasteningof any desired part such as a bearing or even a ball bearing at the endof the shaft without keying, threading or the like. In the case of aball bearing considering that the inner race is cylindrical, the cone ofthe bushing halves providing the shell will be located at the inner faceand will become wedged on a conical section on the shaft.

Figure 3 shows the arrangement of the present invention providing theaxial fastening of a series of elements on a shaft, while Fig. 4 relatesto the fastening of a conventional ball bearing at the end of a shaft,the corresponding reference letters being the same but primed b and 0,respectively.

The pulley B (Fig. 3) mounted on the shaft A is secured to the latter bya nut E screwed on the threaded portion G whereby the bushing halves C Care forced through the medium of the collar N in the groove D and thusbecome wedged on the shaft and against the inner conical wall of thepulley B At the same time the above described arrangemounting inposition the halljaearing J wh ich v serves as the support for the endof shaft A on which same is mounted through the medium of the bushinghalves C, C'. The wedging action is performed by the interior-of 'thelatter, the conical shape of which conforms to that of-tl re shaft end.shoulder I-I' provided in the frame M", the-inner race is secured by themere action of they nut E as the latter travels on the thread G on theshaft, whereby the wedging of the pair of conical 00- operating faces 1isrobtained 1 as =;a -result of *the engagement: Qfthe. respective.groove DPrand- 1collari-Ner Thealatter :provide 1 for the directdisengagement of i theser-ies of parts-as athe; nutrEP i'sunscrewed.K-WhattI 1claim :as my invention wand desire; to secure by LettersPatent is:

1'1 An;.arrangement*forrquick connection or'dis- .connectionrof-adrivingor driven 'partwith or from a: :cylindricalw shaft on one ;.end "ofwhich same is.=snugly "fitted comprising .:a. shoulder on saith-shaftagainst which. said 'part is- "abutted, :slenderer'threadedendvextension. onsaid-zshaft, a conical bore in that sideofxthersaidrpart which iszremotei-from the one: abuttedy-.-against"the-said Since the outer .;r ace abuts .the-

4 shoulder, a sectional shell tapered at the outside thereof to matchsaid conical bore engaged within the same about the shaft, a clampingnut screwed on the threaded end extension of said shaft and means tomake said clamping nut axially rigid. with said shell.

2. In a connecting and disconnecting arrangeziment according to claim 1,in which the means to make said clamping nut axially rigid with saidshell includes (the; provision on the shell of an annular gro.o.ve,,,anda collar on the nut cooperating with the groove and the shell.

t 1-jIn;a:'-connecting and disconnecting arrangementzaccording. to'claim1 in which the means tomake said clamping nut axially rigid with saidshell. includes-theiprovision on the nut of an an- -.n.-ular, groove,and a collar on the shell co-operating with the groove and the nut.

' GEORGES ISNARD.

BEEERENCES- CITED 7 'The followingreferences are of record inthe file-ofthis patent:

UNITED STATES PATENTS

